Busy Lamp Field (BLF) Feature

Updated at June 6th, 2023

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Table of Contents

Introduction: Configuration: Step 1: Step 2: Step 3: Result: Demonstration:

Introduction:

BLF is an acronym for Busy Lamp Field, which is a light on an IP Phone or a colored indicator next to a name in a Softphone or Web client, that tells you whether another extension connected to the same PBX is busy or not.

This feature allows a Monitor Account/Extension to see the status of other extensions. By activating this function, the user will be able to:

Check if another extension is currently on a call;
See if there’s an incoming call to other extensions, and;
If unanswered, User will be able to pick up the call of another extension.

Configuration:

Legend:

Bizphone IP License - sipAAAA = Main Account (Main Extension)
- This account can see the status and monitor other accounts.
Bizphone IP License - sipBBBB = Monitored Account (Monitored Extension)
- This account's status is monitored.

Configuration steps:

Set up the Bizphone IP License - SIP accounts for both Main and Monitored accounts.
Set up BLF Group.
Set up IP Phone Function Keys.

Step 1:

Bizphone IP License can be configured either via Manual or Auto-provisioning process.

For detailed instruction, CLICK HERE.

Step 2:

Go to Bizphone app > Extensions > BLF > Create Group > Select Main Extension > Select Monitored Extension(s) > Finish

Create BLF Group

Choose Main Extension

Choose Monitored Extension(s)

Step 3:

FANVIL IP Phone

Log in to the Device Portal
Go to the Function Key Tab
Randomly select DSS Key (e.g. DSS Key 2) and configure as below:
- Type = Memory Key
- Name = (Whatever you want to appear on the IP Phone keys)
- Value = Monitored Account (sipBBBB)
- Subtype = BLF/NEW CALL
- Line = Line of Main Account (sipAAAA)
- Pickup Number
  - For Grouped Extensions = *8
  - For Non-Grouped Extensions = Pickup Code + Ext number of Monitored Account = *8101

YEALINK IP Phone

Log in to the Device Portal
Go to the DSSKey Ta
Randomly select DSS Key (e.g. DSS Key 2) and configure as below:
- Type = BLF
- Value = Monitored Account (sipBBBB)
- Label = (Whatever you want to appear on the IP Phone keys)
- Line = Line of Main Account (sipAAAA/Line 1)
- Extension
  - For Grouped Extensions = *8
  - For Non-Grouped Extensions = Pickup Code + Ext number of Monitored Account = *8101
Go to Settings Tab
Select Dial Plan
Replace the dialing of sipBBBB (Monitored Account) with extension values.

From Step 1 to Step 3:
From Step 4 to Step 6:

Result:

When configuration steps are completed:

Main Extension can see the Monitored Accounts on their IP Phone.
When a call comes in to Monitored Extensions, the indicator light of the Main Extension will start blinking.
If Monitored Extensions cannot answer calls, Main account can pick up the call simply by pressing on the blinking key.

Demonstration:

blf feature busy lamp

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